Senior Front-End Engineer

Senior Front-End Engineer ( React / Typescript ) | Remote | WorldwideUpstack DataFull-Time Remote | Worldwide$3,500 - $6,000 USD monthly salaryRole hours require working US Eastern TimezoneAbout Upstack DataWe're a customer identity resolution platform helping marketing teams connect ad spend to actual customer behavior. We're a small but fast-growing bootstrapped SaaS company based in the USA with a fully remote team.About The RoleWe are seeking a talented and product-minded Senior Frontend Engineer to join Upstack Data, a customer identity resolution platform helping marketing teams connect ad spend to actual customer behavior. In this role, you will own our frontend applications—both our React-based B2B SaaS product and react based admin tools. You will work directly with our CEO to translate business requirements into high-quality code, making independent UI/UX decisions throughout the product development lifecycle from initial concept to deployment and optimization.A distinguishing aspect of this role is your ability to design clean, modern interfaces without relying on dedicated designers. You will influence product and technology decisions, establish our component library and design system, and build interfaces for complex features including dashboards, analytics views, data tables, integration settings, and billing flows. This is an excellent opportunity for someone passionate about creating impactful B2B SaaS products, with strong product sense and an understanding of what makes tools like Stripe, Linear, and Vercel feel intuitive and polished.Qualifications6+ years of hands-on experience developing production React applications with TypeScriptStrong experience with types and backend API callsExpert proficiency in modern React patterns including hooks, context API, composition, and performance optimizationStrong experience with shadcn/ui, Radix UI, or similar headless component librariesSolid understanding of Tailwind CSS and modern CSS practices (flexbox, grid, responsive design)Strong UI judgment and ability to design intuitive interfaces independently without designer mockupsExperience building B2B SaaS applications with understanding of common UI patterns (data tables, filters, dashboards, forms, settings)Familiarity with RESTful APIs and integration with backend services and third-party platforms (Stripe, analytics, marketing tools)Experience with Git workflows and modern deployment practicesKnowledge of frontend testing frameworks and best practices for code qualityExcellent communication skills and autonomous problem-solving abilitiesAvailable for 4-5 hours overlap with US Eastern timezone Strong english verbal and written communication.ResponsibilitiesDesign, develop, and maintain high-quality React components and features for our SaaS application using TypeScript and shadcn/uiMake independent UI/UX decisions on layouts, user flows, information hierarchy, and interaction patterns that create intuitive user experiencesCollaborate with the CEO on product requirements, providing technical perspective on feasibility and proposing alternative approaches that balance user value with engineering effortEstablish and maintain our component library and design system to ensure consistency and reusability across the applicationParticipate in code reviews and contribute to establishing frontend engineering standards and best practicesOptimize application performance focusing on Core Web Vitals, bundle sizes, load times, and overall user experienceIntegrate frontend applications with backend APIs and third-party services including payment processors, analytics platforms, and marketing toolsWrite comprehensive tests using modern testing frameworks to ensure code quality and reliabilityMonitor and analyze frontend performance metrics, addressing issues proactivelyIdentify opportunities for technical improvements and innovations to enhance both product quality and development efficiencySupport deployment, monitoring, and troubleshooting of applications in production environmentsStay current with React ecosystem trends and emerging frontend technologies to continuously improve our product offeringsCompensation & ApplicationFully remote position.